Animation nodes performance
Try to avoid calculations inside loop if we can do it directly, most of the AN nodes are vectorized, which can perform faster than using loop. So we can modify node tree to something like this:



We can completely eliminate loop by replacing Set Vertex Color node with Object Color Output node since object have only one color and by using Combine Colors node instead of  Mix Colors.





If you have stability or crash problems you can inform developers by creating an issue here